Masahiko Yanagiba lost both parents and, following his mother's will, moved to his maternal uncle's family, the Wakanaes. Although Wakanaes' hospitality was heartwarming, he soon found out why his other relatives shun away from the Wakanaes: his "uncle" is a woman while his "aunt" is just the opposite. Turns out the couple took the appearance of the opposite gender, and now Masahiko has no idea whether his cute cousin, Shion Wakanae, is either a boy or a girl.
 
(Source: Anime News Network)

Volume 1: Tenshi no Okurimono (天使の贈りもの) [1988-11] 
1. Tenshi no Okurimono (天使の贈りもの ) - Weekly Shounen Jump #34, 1988 
 Masahiro and Kyouko are two childhood friends who meet again at university. After a disastrous date, Masahiro discovers that at the train station he is being chased by a girl who keeps calling him "daddy". 
2. Ore wa Otoko da! (おれは男だ!) - Weekly Shounen Jump Special Issue #8, 1980 
 Tsukasa Hojo's debut work.
 Shou is the representative of the students of an all-boys high school, a faithful follower of tradition and with great animosity towards the female sex. Iwasaki is the representative of St. Carolina Academy, open-minded and progressive. What will happen if the two are forced to live together? 
3. Neko-manma Okawari (ネコまんまおかわり♡) - Weekly Shounen Jump #34, 1986 
 A Parody of "Tsuru no Ongaeshi" (鶴の恩返し) with a cat as a main character.
 Yuuichi is a photographer who makes a living by taking scandalous photos of celebrities. One day, while photographing a couple in a hotel, he saves the life of a white cat. That's how he meets Miku, the owner, a young woman with whom he begins to spend a lot of time, but never beyond midnight.... 
4. City Hunter - XYZ (シティーハンター - XYZ -) - Weekly Shounen Jump #18, 1983 
 [City Hunter](https://anilist.co/manga/30792/City-Hunter/) pre-serialization
 Ryo Saeba will have to deal with the protection of a young girl, whose father decided to commit suicide after discovering a bacterium that causes infertility, and can be a terrible weapon in the wrong hands. 
5. City Hunter: Double Edge (シティーハンター - ダブル-エッジ -) - Fresh Jump #2, 1984 
 Ryo Saeba, a beautiful actress and... Jack the Ripper? 
 
Volume 2: Sakura no Hana Saku Koro (桜の花咲くころ) [1993-5] 
6. Sakura no Hana Saku Koro (桜の花 咲くころ) - Weekly Shounen Jump #3-4. 1993 
 A prequel/pilot to the series Komorebi no Moto de. 
7. Family Plot (ファミリー・プロット ) - Weekly Shounen Jump #11, 1992 
 Losing your memory is not only painful for themselves, but also for people who love you. Hideyuki, a photographer, tries to find the memories that bind him to his son and the woman he loved.
 Pilot of Family Compo. 
8. Taxi Driver - Weekly Shounen Jump #6, 1990 
 A story about a vampire who works as a night taxi driver. His victims are his clients…or so it should be, for his good heart often remains with dry mouth, and when a young girl asks for his help, the real trouble begins. 
9. Shoujo no Kisetsu - Summer Dream (少女の季節 -サマー ドリーム- ) - Weekly Shounen Jump #39, 1992 
 Misako was always afraid of water, a distant memory that resurfaces in her dreams, until she finds herself trapped in a strange realm, somewhere between her dream and her past…. 
 
Volume 3:The Summer the Boys Were There: Melody of Jenny (少年たちのいた夏~Melody of Jenny~) [1996-2] 
10. Aozora no Hate - Shounentachi no Senjo (蒼空の果て -少年たちの戦場- ) - Weekly Shounen Jump #16-17, 1995 
 Two brothers are pilots fighting for the Japanese during WWII. The older is an experienced ace; the younger has just finished his training. But it is the younger one who is assigned to a mission that will change his life. 
11. Shounentachi no Ita Natsu ~Melody of Jenny~ (少年たちのいた夏 〜Melody of Jenny〜 ) - Weekly Shounen Jump #28-29, 1995 
 A group of kids in an encampment, set up by the Japanese government during WWII to house and school children, escape in hopes of returning to their families in Tokyo. Along the way, they meet an American who has been living in Japan for the past ten years and agree to travel together, but... 
12. American Dream - Weekly Shounen Jump #36-37, 1995 
 In 1935 in San Francisco, the San Francisco Stars hosted a series of baseball exhibition games with a Japanese baseball team. Amid the increasingly racially tense atmosphere of that time period, ace pitcher Murakawa meets Johnny, an American scout, and Yuu, a Japanese girl living in the States. Amazed by his skills, Johnny asks Murakawa if he wants to pursue the American dream...

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